oss-sec mailing list archives

Version 2.4.5 of the fastcgi library was released last week:
https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5

It fixed CVE-2025-23016, which is described as "an integer overflow (and
resultant heap-based buffer overflow) via crafted nameLen or valueLen
values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c."

The upstream bug report can be found at:
https://github.com/FastCGI-Archives/fcgi2/issues/67

and a detailed writeup from the discoverers at:
https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

which suggests both upgrading to the fixed version and "limiting potential
remote access to the FastCGI socket by declaring it as a UNIX socket."

--
        -Alan Coopersmith-                 alan.coopersmith () oracle com
         Oracle Solaris Engineering - https://blogs.oracle.com/solaris

Current thread:

• CVE-2025-23016: Integer & buffer overflow in fastcgi < 2.4.5 Alan Coopersmith (Apr 23)